Solar panel usable on a refrigeration unit



FIG. 1 is a perspective view of a solar panel usable on a refrigeration unit, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is another perspective view thereof, shown in environmental use.

The broken lines shown represent environmental subject matter and form no part of the claimed design. 

CLAIM We claim, the ornamental design for a solar panel usable on a refrigeration unit, as shown and described. 